Telephone set.



P. L. JENSEN & E. S. PRIDHAM.

TELEPHONE SET.

' APPLICATION .FILED APR. 27, 1914.

' 1,148,781. Y Patent-ed Aug. 3, 1915.

WITNESSES: INVENTORS wafiw ATTORNEY WTEE STATES PATENT @FFTGE.

PETER L. JENSEN AND EDWIN S. PRIDHAM, OF NAPA, CALIFORNIA, ASSIC'NORS TOCOMMERCIAL WIRELESS & DEVELOPMENT 00., 'OF SAN FRANCISCO, CALIFORNIA,

A CORPORATION OF ARIZONA.

TELEPHONE To all whom it may concern Be it known that we, PETER asubject of the King of Denmark, and ED- WIN S. PRIDI-IAM, a citizen ofthe United States, both residing at Napa, in the county of Napa andState of California, have invented new and useful Improvements inTelephone Sets, of which the following is a provide a practicalcommercial telephone set to be used when it is not convenient to holdthe receiver to the ear.

The invention consists of the parts and the combination and constructionof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Figure 1 is anelevation in partial section of a telephone set representing theinvention, and with the adjustable hollow arm out of use position. Fig.2 is a view of the arrangement showing the hollow arm in use position.

Referring to the drawings, 2 is the sound box of a telephone receiver ofthe type wherein a freely movable coil is disposed in strong magneticfield, the diaphragm of the receiver being rigidly attached to the coil.It is to be understood'however, that we do not limit ourselves to thetype shown.

3 is the diaphragm of the sound box. This diaphragm byits positiondivides the sound box into air chambers 45 from ,which are respectivelyled two sound conveying tubes 67.

8 is a hollow handle made of rigid tubing equipped with a suitableholding grip. The grip is adapted to be held in rest position by theforked hook switch as indicated at 9-9 similarly as shown in ourcopending application No. 787 ,945, above referred to. The placing ofthe handle upon the hook or removing it controls the connection of theinstrument to the line as in ordinary tele-.

phone practice. The hollow handle 8 is connected by a flexible tube 10to the tube 6 leading to the sound box 2. The other end Specification ofLetters Patent.

L. JENSEN,

Patented Aug. 3, 1915.

Application filed April 27, 1914. Serial No. 834,699.

of the handle 8 terminates in the 'earpiece 11.

Mounted on the handle 8 at a proper distance from the ear-piece 11 isthe transmitter 12 which by proper connections is adapted to be includedin the telephone circuit. In receiving telephone messages it is a wellknown fact that a great improvement in reception is obtained bylistening with both ears. This method is generally practised in wirelesstelegraphy and in train despatching, but has'seldom been used in ordinary commercial telephony. With the mcreasing use of the telephone forlong distance communication it is Very necessary that every advantageleading to better reception be taken. For this reason we have designed atelephone set which is exceptionally successful for long distance work,both in transmitting and reception. In mounting the transmitter on thehollow handle 8 at a proper distance from the earpiece 11 the user isconstrained to talk correctly into the transmitter which of itself is ofgreat value in telephony and especially so in long distancecommunication. In orderthat listening with both ears may be convenientlyaccomplished, we have mounted upon the handle 8 a light adjustablelistening tube or hollow arm 13.. One end of this adjustable arm isconnected to the tube 7, leading to the sound box 2, by the flexibletube 14. The other end terminates in the ear-piece 15. This hollow armconsists of two sections, one fixed in position in relation with thehollow handle 8, and the other movable through an angular displace 'mentabout the joint 16, and carrying the ear-piece 15. Between the sectionsthere is Fi g. 1, the movable section carrying the earpiece 15 is heldback out of the way;'while in use the action of the spring tends, asindicated in Fig. 2, to press the ear-piece 15 firmly against the ear.In other words, the jointed arm 13 swings through an arc approximately180? about its pivot 16, so that if one does not want to use it, it canbe swung out of the way and remain there, as indicated in Fig. 1, evenwhen the instrument is in use. A further adjustment of this listeningtube is obtained by the adjustable mounting of the earpiece 1 5,. A ball18 through which a hole hasbeen drilled is fitted to the end of themovable section. A socket 19 is fitted over the ball so as to move witha rather stifi action, and to this ear-piece 11 is placed to the ear andthe transmitter is held in the proper position for good articulation,then the movable section of the hollow arm is swung around pivot 16bringing it into use position, and

the ear-piece 15 is adjusted to the other ear. When through talking themovable arm section is folded back and the handle is replaced on theswitch hook, thereby disconnecting the transmitter from the line.

Having thus described our invention what we claim and desire to secureby Letters Patent is- 1. In a telephone set, including a normallyimmovable receiver, an operating device comprising a hollow handleterminating in an ear piece and adjustable upon a hook switch, atransmitter mouth piece mounted on said hollow handle, an adjustablehollow arm with an ear piece connected to said handle, and flexibletubing connecting the sound box of said receiver to said hollow handleand hollow arm whereby the operation of said receiver may be heard, saidtubing permitting said hollow handle to be placed upon or removed fromsaid switch hook, thereby controlling the circuits of said set andallowing free universal movement of the ear pieces as to the relativelystationary receiver.

2. In a telephone set, the combination with a movable hollow handle uponwhich is mounted the transmitter of said set, said hollow handle beingconnected to the sound box of the receiver of said set by a flexibletube and said hollow handle terminating in an ear-piece, of anadjustable hollow arm said adjustable hollow arm being mounted upon saidhollow handle, one end of said hollow arm terminating in an ear-piece,the other end of said arm being connected to the sound box of saidreceiver by a flexible tube.

3. In a telephoneset, comprising a transmitter, a receiver and ahookswitch, said receiv r being provided with a sound box, saidtransmitter being mounted upon a hollow handle, an adjustable hollowarm, said hollow arm being mounted upon said hollow handle, said hollowarm being made in two sections connected together by a' oint, one ofsald sections bemg fixed in relation with said hollow handle, the othersection being movable through an angle about said fixed section by theaction of said joint, said movable section being equipped with anadjustable ear-piece and said fixed section being connected by aflexible tube to the sound box of said receiver, and a spring connectionbetween said fixed section and said movable section by virtue of whichsaid movable section is held in proper position, substantially asdescribed.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

PETER L. JENSEN. ED'WIN S. PRIDHAM.

Witnesses:

W. W. HEALEY, M. KANDERER.

